Reference > Maslow's hierarchy of needs
Description :: Pyramid
Loose copy, for searching:

Physiological: breathing, drinking, eating, excreting, sleeping, reproducing
Safety/Security: of body, of health, of employment, of family, of property, of morality
Social: friendship, family, intimacy, belonging, acceptance
Esteem: self-esteem, confidence, achievement, respect
Transcendence: morality, creativity, problem-solving

Link :: http://en.wikipedia.org/wiki/Maslow's_hierarchy_of_needs